Electrochemical and quantum chemical studies on phthalhydrazide as corrosion inhibitor for mild steel in 1 M HCl solution

被引：15

作者：

Musa, Ahmed Y. ^{[1
]}

Mohamad, Abu Bakar ^{[1
]}

Takriff, Mohd Sobri ^{[1
]}

Jalgham, Ramzi T. T. ^{[1
]}

机构：

[1] Univ Kebangsaan Malaysia, Dept Chem & Proc Engn, Bangi 43600, Selangor, Malaysia

来源：

RESEARCH ON CHEMICAL INTERMEDIATES | 2012年 / 38卷 / 02期

关键词：

Acid corrosion; Corrosion inhibitor; EIS; Quantum chemical calculations; HYDROCHLORIC-ACID;

D O I：

10.1007/s11164-011-0362-3

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The inhibition ability of phthalhydrazide (PTD) for mild steel in 1 M HCl at 30 A degrees C was investigated by electrochemical measurements [impedance spectroscopy (EIS) and potentiodynamic polarization techniques] and quantum chemical calculations. The frontier molecular orbital energy E (HOMO) (highest occupied molecular orbital), E (LUMO) (lowest unoccupied molecular orbital), and the Mulliken charge distribution were calculated and are discussed. Results showed that the inhibition efficiency of PTD increased with inhibitor concentration. The maximum corrosion inhibition efficiency was 77.6% at 2 mM PTD. Adsorption of the inhibitor followed the Langmuir adsorption isotherm. Adsorption of inhibitor molecules on mild steel surface occurred spontaneously and chemically. Quantum chemical calculations showed that the low performance of PTD as a corrosion inhibitor is due to the large energy gap (E (HOMO) - E (LUMO)).

引用

页码：453 / 461

页数：9

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